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Pretty similar are:
Ardeadoris averni which has also a pure white mantle, it differs the broad orange-red band at the mantle margin, and by the orange-red rhinophores and gills,
Ardeadoris sp. 01 which has also a pure white mantle, and white gills and rhinophores, it differs by the thin red line at the mantle margin, followed by a diffuse pale red submarginal band, followed by a broad opaque white band.
More information on Ardeadoris egretta are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 31 January 2017, Ardeadoris egretta Rudman, 1984
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Ardeadoris_egretta.htm